Series of absorbent articles

Abstract

To provide a series of absorbent articles capable of providing proper absorbent articles according to a growth stage of a wearer.SOLUTION: In a series of absorbent articles, in a plurality of size groups included in the series, all relationships A-C are satisfied: the relationship A is relatively small size group<relatively large size group in a whole length of an absorbent article 1 in a vertical direction X; the relationship B is relatively small size group<relatively large size group in a ratio of a fixed length L7 of a back panel 7 in a vertical direction X to a whole length of the absorbent article 1 in the vertical direction X, or about a size group of a relatively small size group=relatively large size group; the relationship C is the relatively small size group>relatively large size group in a ratio of a fixed length L14 of an abdominal panel 14 in the vertical direction X to a whole length of the absorbent article 1 in the vertical direction X.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a series of absorbent articles including a plurality of absorbent articles of different sizes.

Background Art

[0002] Absorbent articles such as disposable diapers typically have a ventral part arranged on the ventral side of the wearer, a dorsal part arranged on the dorsal side, and a crotch part located between them, and include an absorbent body that absorbs and retains the body fluid of the wearer. Conventionally, a pair of dorsal panels having elasticity in the lateral direction orthogonal to the longitudinal direction (the direction corresponding to the front-back direction of the wearer) are attached to both side edges along the longitudinal direction of the absorbent body in the dorsal part so as to extend outward in the lateral direction from the side edges, and a fastening tape is attached to the tip of the extending direction of each dorsal panel. A disposable diaper of this type is known. This disposable diaper can be worn by stretching the fastening tape on the dorsal part to the ventral side of the wearer and fastening the fastening part provided at the tip of the tape to the outer surface of the ventral part. Such an absorbent article with side panels can be manufactured by producing the side panels in a separate process from the absorbent body and adding this to the absorbent body, so that the amount of materials used for the side panels and the waste generated from the materials can be suppressed, and it is excellent in terms of the environment and cost.

[0003] Patent Document 1 describes a disposable diaper with a dorsal panel, in which a pair of ventral panels made of a non-stretchable sheet material are attached to both side edges of the absorbent body in the ventral part. One of the main roles of the ventral panel is to assist in the diaper wearing operation. That is, when wearing a disposable diaper, typically, while temporarily fixing the ventral part of the diaper to the wearer's body, the fastening tape attached to the dorsal part is pulled toward the ventral part side, and an operation of fastening the fastening part provided at the tip of the fastening tape to the outer surface of the ventral part is performed. The temporary fixing of this ventral part is performed using the ventral panel, for example, by pulling the ventral panel toward the dorsal part side, so that the diaper wearing operation can be performed more smoothly. In addition, the fastening part provided on the fastening tape may be made of a relatively hard material such as the male member of a mechanical surface fastener. When such a hard material fastening part comes into contact with the wearer's skin due to, for example, a wearing operation error or an unexpected detachment from the fastening destination of the fastening part, it may lead to skin trouble. The ventral panel also plays a role in preventing the inconvenience caused by the contact between such a fastening part and the wearer's skin in advance.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Generally, a disposable diaper has less stretchable parts compared to a pant diaper with a waist opening and leg openings, so it has inferior fit to the wearer's body and is prone to leakage. Also generally, infants, who are the main wearers of disposable diapers, have significant physical growth, their bodies grow large in a relatively short period, and their unique physical activities become active. Therefore, as a disposable diaper, it is desired to be able to accommodate such unique physical growth of infants and have appropriate dimensions according to the wearer's growth stage and excellent fit to the body. More specifically, especially in the period of infants from zero days old to less than 1 year old, starting from a state of sleeping all day, they can move their feet, turn over, sit, then crawl on their stomachs, and finally stand up. Early developers can even walk alone. The change in behavior patterns accompanying this growth affects the fit of the diaper to the body. Thus, as an absorbent article for infants who grow rapidly in one year, it is desired to be able to conform to the behavior patterns of infants at different growth stages and have excellent fit to the body. Furthermore, since the frequency of diaper changes for infants is very high, it is desired that the diaper is easy to put on the infant wearer, reducing the burden on both the wearer (infant) and the person putting it on (such as the infant's mother). Conventional absorbent articles have not been sufficiently designed in a product group that takes into account corresponding to such physical growth of the wearer and being easy to wear, leaving room for improvement.

[0006] The problem of the present invention relates to providing a series of absorbent articles that can provide appropriate absorbent articles according to the growth stage of the wearer.

Means for Solving the Problem

[0007] The present invention is a series of absorbent articles including a plurality of absorbent articles of different sizes, and the plurality of absorbent articles are divided into a plurality of size groups corresponding to the number of types of their sizes. In one embodiment of the series of absorbent articles of the present invention, each of the plurality of absorbent articles has a longitudinal direction extending from the ventral side of the wearer through the crotch portion to the dorsal side and a transverse direction orthogonal thereto, and has, in the longitudinal direction, a lower crotch portion disposed in the crotch portion during wearing, a ventral portion disposed on the ventral side of the wearer relative to the lower crotch portion, and a dorsal portion disposed on the dorsal side of the wearer relative to the lower crotch portion, and an absorbent main body including an absorber, a pair of fastening members fixed to both side edges along the longitudinal direction of the absorbent main body in the dorsal portion, and a pair of ventral panels fixed to both side edges along the longitudinal direction of the absorbent main body in the ventral portion, and the fastening members are fastened to the outer surface of the absorbent main body so as to be worn by the wearer. In one embodiment of the series of absorbent articles of the present invention, the absorber includes a laminated structure of two or more absorbent cores. In one embodiment of the series of absorbent articles of the present invention, each of the pair of fastening members includes a dorsal panel fixed to the absorbent main body so as to extend outward in the transverse direction from a side edge along the longitudinal direction of the absorbent main body, and the dorsal panel has a longer fixed length in the longitudinal direction with respect to the absorbent main body than the ventral panel. In one embodiment of the series of absorbent articles of the present invention, all of the following relationships A to C are satisfied among the plurality of size groups. Relationship A: For the total length in the longitudinal direction of the absorbent article, a size group with a relatively small size < a size group with a relatively large size Relationship B: For the ratio of the fixed length in the longitudinal direction of the dorsal panel to the total length in the longitudinal direction of the absorbent article, a size group with a relatively small size < a size group with a relatively large size, or a size group with a relatively small size = a size group with a relatively large size Relationship C: For the ratio of the fixed length in the longitudinal direction of the ventral panel to the total length in the longitudinal direction of the absorbent article, a size group with a relatively small size > a size group with a relatively large size Other features, effects, and embodiments of the present invention will be described below.

Effects of the Invention

[0008] According to the present invention, a series of absorbent articles is provided that can provide appropriate absorbent articles according to the growth stage of wearers including infants. The absorbent articles provided by the present invention can conform to the behavior patterns of infants in the growth stage, are excellent in fitness to the body, have easy wearing operations, and reduce the burden during wearing.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0010] Hereinafter, the present invention will be described based on its preferred embodiments with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. The drawings are basically schematic, and the ratios of each dimension etc. may be different from the actual ones.

[0011] The series of absorbent articles of the present invention (hereinafter, also simply referred to as "series") includes at least two or more types of absorbent articles having different sizes (dimensions). In the present invention, the "absorbent article" refers to an article used for absorbing body fluids (urine, soft feces, menstrual blood, sweat, etc.) discharged from the human body, and includes, for example, disposable diapers and the like.

[0012] Figs. 1 to 3 show a disposable diaper 1 which is an embodiment of an absorbent article included in the series of the present invention. The diaper 1 has a longitudinal direction X corresponding to the front-back direction of the wearer, that is, the direction extending from the ventral side through the crotch to the dorsal side, and a transverse direction Y orthogonal to the longitudinal direction X. Further, the diaper 1 is disposed in the crotch of the wearer and includes a lower crotch portion B including an excretion portion facing portion (not shown) facing an excretion portion such as the penis, a ventral side portion A disposed on the ventral side (front side) of the wearer with respect to the lower crotch portion B, and a dorsal side portion C disposed on the dorsal side (rear side) of the wearer with respect to the lower crotch portion B.

[0013] In the present embodiment, the diaper 1 is symmetrically formed on one side and the other side with respect to the horizontal center line CLy in the unfolded and longitudinally maximally extended state as shown in Fig. 1. The ventral side portion A is a part of the front body portion F of the diaper 1, and the dorsal side portion C is a part of the rear body portion R of the diaper 1. The lower crotch portion B straddles the longitudinal center line CLx in the longitudinal direction X and exists across both the front body portion F and the rear body portion R. In the present invention, the ventral side portion A, the lower crotch portion B, and the dorsal side portion C can be the respective regions when the diaper 1 in the unfolded and longitudinally maximally extended state is trisected in the longitudinal direction X.

[0014] The horizontal center line CLy is a virtual straight line that bisects the diaper 1 in the unfolded and longitudinally maximally extended state in the transverse direction Y and extends in the longitudinal direction X. Further, the longitudinal center line CLx is a virtual straight line that bisects the diaper 1 in the unfolded and longitudinally maximally extended state in the longitudinal direction X and extends in the transverse direction Y. The above-mentioned "unfolded and longitudinally maximally extended state" means a state in which the object (such as an absorbent article) is spread out flat to an unfolded state, and an elastic member that can be extended in the longitudinal direction X of the object in the unfolded state is maximally extended in the longitudinal direction X, and it is spread out flat until it becomes the same as the dimension when the influence of the elastic member that can be extended in the longitudinal direction X is completely excluded.

[0015] The diaper 1 is a so-called expandable diaper, and includes an absorbent main body 2 containing an absorber 5, a pair of fastening members 6, 6 fixed to both side edges (side flap portions 21) along the longitudinal direction X of the absorbent main body 2 in the back side portion C, and a pair of ventral panels 14, 14 fixed to both side edges (side flap portions 21) along the longitudinal direction X of the absorbent main body 2 in the ventral side portion A. The fastening member 6 (more specifically, the fastening portion 82 of the fastening tape 8 described later) is fastened to the fastened region 9 on the outer surface (non-skin facing surface) of the absorbent main body 2 so as to be worn by the wearer.

[0016] In the present embodiment, the absorbent main body 2 has a rectangular shape that is long in the longitudinal direction X in a plan view of the diaper 1 in the deployed and maximum longitudinally extended state as shown in FIG. 1. The absorbent main body 2 is a member that forms the main body of the diaper 1, and in addition to the absorber 5, includes a surface sheet 3 disposed on the skin-facing surface side of the absorber 5 and a back sheet 4 disposed on the non-skin facing surface side of the absorber 5. Both sheets 3 and 4 extend outward in the longitudinal direction X from both ends of the absorber 5 in the longitudinal direction X, and also extend outward in the lateral direction Y from both side edges of the absorber 5 along the longitudinal direction X. The constituent members of the absorbent main body 2 are joined to each other by known joining means such as an adhesive. The absorbent main body 2 includes a portion where the three types of members 3, 4, and 5 are disposed (the portion overlapping the absorber 5 in plan view) and a portion where at least one of the members 3 and 4 other than the absorber 5 is disposed (flap portion).

[0017] In this specification, the "skin-facing surface" is the surface that faces the wearer's skin when the absorbent article or its constituent member (for example, the absorber) is focused on, and the "non-skin facing surface" is the surface that faces the opposite side of the wearer's skin when the absorbent article is worn. That is, the skin-facing surface is the surface on the relatively closer side to the wearer's skin, and the non-skin facing surface is the surface on the relatively farther side from the wearer's skin. Also, "when worn" and "worn state" refer to the state in which the proper wearing position of the absorbent article is maintained and worn.

[0018] As the constituent members of the absorbent main body 2, those commonly used in this type of absorbent article can be used without particular limitation. As the surface sheet 3, various sheets having liquid permeability can be used, for example, non-woven fabric, woven fabric, and paper. As the back sheet 4, a sheet having leak-proof properties, specifically, a liquid-impermeable (a property of not allowing any liquid to pass through) or liquid-difficult-to-permeate (not to the extent of liquid impermeability, but a property of being difficult for liquid to pass through) sheet can be used. For example, a moisture-permeable resin film, a laminate of the resin film and non-woven fabric can be mentioned. The absorber 5 typically includes an absorbent core mainly composed of at least a water-absorbing material. Examples of the water-absorbing material include hydrophilic fibers and water-absorbing polymers, and one of these can be used alone or two or more of them can be combined. Examples of the hydrophilic fibers include natural fibers such as wood pulp and hydrophilic synthetic fibers. As the water-absorbing polymer, those conventionally used in this type of absorber can be used without particular limitation. For example, polymers or copolymers of acrylic acid or alkali metal salts of acrylic acid can be mentioned.

[0019] As shown in FIGS. 1 and 2, the absorber 5 of the present embodiment includes a laminated structure of two or more absorbent cores. Specifically, the absorber 5 includes a first core 51 and a second core 52 disposed on the non-skin-facing surface side of the first core 51. Both cores 51 and 52 are absorbent cores mainly composed of a water-absorbing material. The absorbent core can be roughly classified into the following fiber-laying type and sheet type, and in the present invention, any type can be used. The stacked type absorbent core typically mainly consists of an aggregate of fiber materials such as hydrophilic fibers, and has a configuration in which water-absorbent polymer particles are supported on the aggregate as required. The stacked type absorbent core can be manufactured according to a conventional method using a known stacking device equipped with a rotating drum. The stacking device typically includes a rotating drum having stacking recesses formed on its outer peripheral surface, and a duct having a flow path inside for transporting the forming materials (fibers, water-absorbent polymer particles) of the absorbent core to the stacking recesses. While rotating the rotating drum around the rotation axis along the circumferential direction of the drum, the forming materials transported by riding on the air flow generated in the flow path by suction from the inner side of the rotating drum are stacked in the stacking recesses. The sheet type absorbent core typically has a configuration in which water-absorbent polymer particles are fixed inside or on the surface of a fiber sheet, and is also called an absorbent sheet or the like. As the fiber sheet, for example, paper, non-woven fabric, etc. can be used. The sheet type absorbent core is thinner and more flexible than the stacked type absorbent core. The sheet type absorbent core can, for example, have a configuration in which water-absorbent polymer particles are interposed between two opposing fiber sheets. As the sheet type absorbent core, those described in Japanese Patent No. 2963647 and Japanese Patent No. 2955223 can also be used.

[0020] In the present invention, one of the two cores 51, 52 may be of the stacked type and the other of the sheet type, or both may be of the stacked type or the sheet type. As a preferred embodiment of the absorber 5, a form in which the first core 51 is of the stacked type and the second core is of the sheet type can be mentioned. The basis weight of the stacked type absorbent core is preferably 100 g / m 2 or more, more preferably 150 g / m 2 or more, and preferably 400 g / m 2 or less, more preferably 300 g / m 2 or less. The basis weight of the sheet type absorbent core is preferably 80 g / m 2 or more, more preferably 100 g / m 2 or more, and preferably 150 g / m2 More preferably, it is 130 g / m 2 or less as follows.

[0021] In the present embodiment, both cores 51 and 52 are rectangular in plan view, and their longitudinal directions coincide with the vertical direction X. The first core 51 has a shorter length (width) in the lateral direction Y than the second core 52. The second core 52 has a pair of extending portions that extend outward in the lateral direction Y from both side edges along the vertical direction X of the first core 51 at least in the crotch portion B. Also, in the present embodiment, the first core 51 is shorter in the vertical direction X than the second core 52. A region extending inward in the vertical direction X by a predetermined distance from the end in the vertical direction X on the back side portion C side of the second core 52 (most of the region near the crotch portion B in the region sandwiched between the pair of back panels 7, 7) is a non-arrangement region of the first core 51 (see FIG. 3). In the diaper 1, the first core 51 is biased toward the ventral side portion A. In the present invention, the plan view shapes, sizes, and arrangements of both cores 51 and 52 are not particularly limited and can be appropriately adjusted according to the type, use, etc. of the absorbent article.

[0022] As shown in FIGS. 2 and 3, the absorber 5 of the present embodiment includes a core wrap sheet 53 that covers the outer surfaces of both cores 51 and 52. In the present embodiment, in the region where both cores 51 and 52 exist (ventral side portion A, crotch portion B), both cores 51 and 52 are integrally covered with the core wrap sheet 53 (see FIG. 2), but in this region, both cores 51 and 52 may be individually covered with a core wrap sheet. As the core wrap sheet 53, a liquid-permeable sheet is preferable, and for example, paper, non-woven fabric, etc. can be used.

[0023] In this embodiment, the diaper 1 includes a pair of leak - proof cuffs 10, 10 disposed along both side edges along the longitudinal direction X of the absorbent main body 2. Each leak - proof cuff 10 includes a liquid - impermeable and breathable leak - proof sheet 11. One end side in the transverse direction Y of the leak - proof sheet 11 is fixed to another member (the back sheet 4 in the form shown in FIG. 2) to form a fixed end portion, and the other end side in the transverse direction Y of the leak - proof sheet 11 is a free end portion not fixed to another member. An elastic member 12 for forming the leak - proof cuff is fixed in an extended state in the longitudinal direction X to the free end portion of the leak - proof sheet 11 so as to be arranged to be stretchable and contractible in the same direction. When the diaper 1 is worn, due to the contraction force of the elastic member 12, at least in the crotch portion B, the free end portion side of the leak - proof sheet 11 stands up toward the wearer side with the fixed end portion as the standing base end, so that the pair of leak - proof cuffs 10, 10 stand up, thereby preventing the lateral outflow of excrement such as urine in the transverse direction Y. In FIG. 2, for the convenience of explanation, the leak - proof cuff 10 is shown in a standing state. However, in the diaper 1 in the unfolded and longitudinally maximally extended state as shown in FIG. 1, the leak - proof cuff 10 does not necessarily stand up as shown in FIG. 2.

[0024] In this embodiment, the absorbent main body 2 includes a flap portion located outward of the periphery of the absorber 5. The flap portion is constituted by a member arranged to straddle the periphery of the absorber 5. In the illustrated form, it includes the surface sheet 3, the back sheet 4, and the leak - proof sheet 11 (see FIG. 2). The plurality of members constituting the flap portion are joined to each other by known joining means such as adhesives, heat sealing, and ultrasonic sealing. In the flap portion, the both side edges along the longitudinal direction X of the absorber 5 and the portions located outward in the transverse direction Y from the virtual extension lines of the both side edges are side flap portions 21 which are the both side edge portions along the longitudinal direction X of the absorbent main body 2 (in other words, the both end portions in the transverse direction Y). The outermost portion in the transverse direction Y of the side flap portion 21 is the side edge 2S along the longitudinal direction X of the absorbent main body 2. In at least the crotch portion B of each of the pair of side flap portions 21, 21, an elastic member 13 for forming leg gathers is arranged to be stretchable and contractible in the longitudinal direction X.

[0025] Next, the fixing member 6, which is one of the characteristic parts of the diaper 1, will be described in detail. In the present embodiment, a pair of fixing members 6, 6 each include a back panel 7 fixed to the absorbent body 2 so as to extend outward in the lateral direction Y from the side edge 2S of the absorbent body 2 as shown in FIGS. 1 and 3.

[0026] In the present embodiment, the back panel 7 has elasticity in the lateral direction Y. In the present embodiment, the back panel 7 includes an elastic member 72 arranged so as to be stretchable in the lateral direction Y as shown in FIGS. 1 and 3, and the elastic member 72 imparts elasticity in the same direction. That is, in the present embodiment, the back panel 7 includes a panel material 71 that forms the main body of the back panel 7 and an elastic member 72 fixed to the panel material 71 so as to be stretchable in the lateral direction Y. More specifically, the back panel 7 includes two opposing panel materials 71, 71, and a plurality of elastic members 72 extending in the lateral direction Y are intermittently arranged in the longitudinal direction X between the two panel materials 71, 71. The material of the panel material 71 is not particularly limited. For example, non-woven fabrics produced by various manufacturing methods such as air-through non-woven fabric, heat-rolled non-woven fabric, spunlace non-woven fabric, spunbond non-woven fabric, meltblown non-woven fabric; woven fabric, knitted fabric, paper, resin film, etc. can be mentioned, and a composite sheet formed by laminating and integrating one or more of these can also be used. In the present invention, the means for imparting elasticity in the lateral direction Y to the back panel 7 is not particularly limited, and the panel material 71 may have elasticity in the lateral direction Y. In that case, the back panel 7 may not include the elastic member 72.

[0027] In this embodiment, the back panel 7 has a rectangular shape in plan view, more specifically a rectangular shape, when the diaper 1 is in the deployed and maximum longitudinally extended state. That is, the back panel 7 has an outer edge 7X1 and an inner edge 7X2 along the longitudinal direction X, and an outer end 7Y1 and an inner end 7Y2 along the transverse direction Y. A fastening tape 8, which will be described later and is provided in the fastening member 6, is fixed to the outer edge 7X1 and its vicinity (the outer edge portion of the back panel 7). The inner edge 7X2 of the back panel 7 and its vicinity (the inner edge portion of the back panel 7) are fixed to the side flap portion 21, which is the side edge portion of the absorbent body 2, by known fixing means such as an adhesive or fusion. In the illustrated form, the inner edge portion of the back panel 7 is fixed between two opposing sheets (the back sheet 4 and the leak-proof sheet 11) that constitute the side flap portion 21 (see FIG. 3). However, the fixing position of the back panel 7 on the absorbent body 2 is not particularly limited, and it may be on the skin-facing surface of the side flap portion 21 (the skin-facing surface of the leak-proof sheet 11 in the illustrated form), or on the non-skin-facing surface of the side flap portion 21 (the non-skin-facing surface of the back sheet 4 in the illustrated form). The outer end 7Y1 of the back panel 7 is located relatively far from the longitudinal center line CLx of the diaper 1, and the inner end 7Y2 of the back panel 7 is located relatively close to the longitudinal center line CLx.

[0028] In this specification, the "side edge along the longitudinal direction" of the absorbent article or its constituent member (for example, the side edge 2S of the absorbent body 2, the outer edge 7X1 and the inner edge 7X2 of the back panel 7 described above) refers to the edge (a linear portion in plan view) along the longitudinal direction X of the object. Also, the "side edge portion" such as the side edge portion of the absorbent body 2, the outer edge portion and the inner edge portion of the back panel 7 refers to a portion including the side edge of the object and its vicinity, and is typically a strip-shaped portion in plan view that extends in the longitudinal direction X and has a predetermined length in the transverse direction Y. Also in this specification, the "longitudinal end" of the absorbent article or its constituent member, such as the outer end 7Y1 and the inner end 7Y2 of the back panel 7, refers to the edge (a linear portion in plan view) along the transverse direction Y of the object. Also, a portion including such a longitudinal end and its vicinity (for example, the outer end 7Y1 and its vicinity) is a "longitudinal end portion".

[0029] In this embodiment, each of the pair of fastening members 6, 6 further includes a fastening tape 8 fixed to the back panel 7 so as to extend outward in the lateral direction Y from the outer edge 7X1 of the back panel 7 in addition to the back panel 7. As the fastening tape 8, those that can be used in this type of disposable diaper can be used without particular limitation. In this embodiment, as shown in FIGS. 1 and 3, the fastening tape 8 includes a tape base material 81 having a rectangular shape in plan view and a fastening portion 82 fixed to the tape base material 81. The material of the tape base material 81 is not particularly limited, and for example, a non-woven fabric, a laminate of a non-woven fabric and a resin film, or the like can be used. One end portion in the longitudinal direction (lateral direction Y) of the fastening tape 8 is fixed to the outer edge 7X1 of the back panel 7 and the vicinity thereof (the outer edge portion of the back panel 7) by known fixing means such as an adhesive or heat fusion. In the illustrated form, the fastening tape 8 is fixed to the non-skin-facing surface of the back panel 7 (see FIG. 3), but it may be fixed to the skin-facing surface of the back panel 7.

[0030] The fastening portion 82 is fixed to the skin-facing surface of the extending portion from the outer edge 7X1 of the back panel 7 in the tape base material 81. The fastening portion 82 is configured to be detachably fastened to a fastened region 9 (see FIG. 1) provided on the non-skin-facing surface of the absorbent body 2 in the ventral portion A. In the present invention, the fastening structure including the fastening portion 82 and the fastened region 9 is not particularly limited, and the fastening structure in this type of disposable diaper can be used without particular limitation. As an example of the fastening structure, a mechanical surface fastener can be mentioned. The "mechanical surface fastener" referred to here means a fastener in which a face member (male member) having a hook material (engaging member) made of hook-shaped protrusions arranged on one surface and a face member (female member) having a loop material made of pile-shaped protrusions arranged on one surface are paired. As a specific example of the mechanical surface fastener, Velcro (registered trademark) can be mentioned. Typically, the fastening portion 82 is the male member and the fastened region is the female member, but the reverse may also be true.

[0031] As shown in Fig. 1, a pair of ventral panels 14, 14 extending outward in the lateral direction Y from both side edges 2S, 2S of the absorbent body 2 are provided on the ventral part A. As described above, the ventral panel 14 serves to assist in the wearing operation of the diaper 1, and also serves to prevent inconveniences caused by the contact between the fastening portion 82 of the fastening tape 8 and the skin of the wearer. The ventral panel 14 is fixed to the side edge portion (side flap portion 21) of the absorbent body 2, similarly to the dorsal panel 7. Regarding the method of fixing the ventral panel 14 to the absorbent body 2 (fixing means, fixing position, etc.), the description regarding the method of fixing the dorsal panel 7 to the absorbent body 2 described above is appropriately applied. The material of the ventral panel 14 is not particularly limited, and for example, a non-stretchable sheet material (e.g., non-woven fabric) can be used.

[0032] As shown in Fig. 1, the fixing length L7 in the longitudinal direction X of the dorsal panel 7 to the absorbent body 2 is longer than the fixing length L14 in the longitudinal direction X of the ventral panel 14 to the absorbent body 2. In the present embodiment, the fixing length L7 of the dorsal panel 7 is also longer than the fixing length L8 in the longitudinal direction X of the fastening tape 8 to the dorsal panel 7, and a magnitude relationship of L7 > L14 > L8 is established regarding the fixing length in the longitudinal direction X. Here, the "fixing length L7" refers to the length in the longitudinal direction X of the overlapping portion of the dorsal panel 7 with the side edge 2S of the absorbent body 2. Also, the "fixing length L14" refers to the length in the longitudinal direction X of the overlapping portion of the ventral panel 14 with the side edge 2S of the absorbent body 2. Also, the "fixing length L8" refers to the length in the longitudinal direction X of the overlapping portion of the fastening tape 8 with the outer edge 7X1 of the dorsal panel 7. That is, the fixing lengths L7, L8, and L14 are the lengths in the longitudinal direction X of the portion adjacent to the boundary with the non-fixed portion (the extending portion from the fixing destination) in the fixing portion of the member (dorsal panel 7, fastening tape 8, or ventral panel 14), and are the lengths along the longitudinal direction X at the base of the so-called member.

[0033] The series of the present invention includes a plurality of absorbent articles of different sizes (e.g., the diaper 1 described above), and the plurality of absorbent articles are divided into a plurality of size groups corresponding to the number of types of their sizes. In the present invention, the index of "size" is not particularly limited, and physical properties of the absorbent article or its constituent members (for example, the absorbent main body 2 or the absorber 5 in the diaper 1) that can reflect the size of the absorbent article can be used without particular limitation. For example, it can be the total length in one direction (longitudinal direction, lateral direction, etc.) of the absorbent article or its constituent members, or the area of the skin-facing surface or the non-skin-facing surface. The "size difference" as referred to in the present invention typically means that, between the absorbent articles to be compared, the physical properties serving as the size index are different from each other. Also in the present invention, "the sizes of the absorbent articles are the same" (in other words, there is no size difference) includes both the case where the physical properties serving as the size index of a plurality of absorbent articles are the same and the case where they do not match but fall within a predetermined range. That is, in the present invention, a plurality of absorbent articles constituting one size group may have different physical properties on the premise that the physical properties serving as the size index are within a predetermined range.

[0034] As a preferable example of the physical property serving as the size index of the absorbent article, there is the total length in the longitudinal direction (hereinafter also referred to as "longitudinal total length") in a non-stressed state (natural state without external force) when the absorbent article is unfolded and in the maximum longitudinal elongation state. For example, referring to FIG. 1, when the aforementioned diaper 1 is unfolded and in the maximum longitudinal elongation state and under non-stress, the length along the longitudinal direction X between the longitudinal end 1a on the ventral side A and the longitudinal end 1c on the dorsal side C is the longitudinal total length of the diaper 1. As one embodiment of the series of the present invention, there is an example including a plurality of absorbent articles having different longitudinal total lengths, and the plurality of absorbent articles are divided into a plurality of size groups corresponding to the number of types of their longitudinal total lengths.

[0035] In the series of the present invention, multiple absorbent articles of different sizes may differ not only in size but also in elements other than size (structural or compositional elements). That is, in the present invention, elements other than the size of the absorbent article may differ between multiple size groups. For example, taking the diaper 1 described above as an example, among multiple diapers 1 having different sizes (total longitudinal length) included in the series, the absorbent body 5 provided in the diaper 1 may differ structurally or compositionally. The series of the present invention typically has substantially the same elements other than size among the multiple absorbent articles included therein.

[0036] The series of the present invention may have a common name (brand name) for the multiple absorbent articles (multiple size groups) included therein. In that case, each of the multiple absorbent articles is one of the product lineups of the product group sold under that common name. The common name is displayed, for example, on the absorbent article or its packaging container. From the viewpoint of providing an absorbent article of an appropriate size according to the body shape of the wearer, it is preferable that all of the following relationships A to C described later are satisfied among all size groups having a common brand name in the series of the present invention.

[0037] The number of size groups in the series of the present invention can be 3 or more. By having 3 or more size groups, the width of the size of the absorbent article as a whole series is widened, so that it becomes possible to provide an absorbent article of an appropriate size according to the body shape of the wearer. For example, for infants whose bodies grow significantly in a relatively short period (children from zero days after birth to less than 1 year old), an absorbent article suitable for the growth stage of their bodies can be provided. As one embodiment of the series of the present invention, there is a form including a plurality of each of five types of absorbent articles, namely, a first size (e.g., NB size), a second size (e.g., S size), a third size (e.g., M size), a fourth size (e.g., L size), and a fifth size (e.g., XL size) in ascending order of size (e.g., the total longitudinal length of the absorbent article). In such a form, the five types of absorbent articles are divided into five groups: a first size group, a second size group, a third size group, a fourth size group, and a fifth size group. Such a form is particularly useful when the wearer of the absorbent article is an infant.

[0038] The series of the present invention includes a form in which each of a plurality of size groups includes a plurality of absorbent articles and a packaging container that houses the plurality of absorbent articles therein. FIG. 4 shows a packaging structure 15 of absorbent articles, which is an embodiment of a size group in such a form. The packaging structure 15 includes a plurality of diapers 1 as absorbent articles and a packaging container 16 that houses them therein. The plurality of diapers 1 in the packaging container 16 are compositionally or structurally identical and have the same size, not different sizes. The meaning of "the same size" as referred to here is as described above. As one embodiment of the series of the present invention, there is a form including a plurality of packaging structures 15 corresponding to a plurality of size groups. That is, the series of the present invention can be an aggregate of packaging structures of absorbent articles represented by the packaging structure 15.

[0039] In the packaging structure 15, each of the plurality of diapers 1 is accommodated inside the packaging container 16 in a folded state. In the present embodiment, each of the plurality of diapers 1 inside the packaging container 16 is folded in half in the longitudinal direction X with the skin-facing side (the surface sheet 3 side) on the inside. Then, the plurality of folded diapers 1 are stacked in one direction to form a stack, and the stack is accommodated inside the packaging container 16 in a state where a plurality of them are stacked in the height direction of the packaging structure 15 and integrally compressed. The packaging container 16 may be any container that can accommodate the plurality of diapers 1, and the material and configuration are not particularly limited. In the illustrated form, the packaging container 16 is a packaging bag made of a flexible sheet.

[0040] On the outer surface of the packaging container 16, a common name (brand name) for the plurality of diapers 1 included in the series may be displayed by printing or the like. Also, information regarding the diaper 1 inside the packaging container 16 may be displayed by printing or the like on the outer surface of the packaging container 16. Examples of the "information related to the diaper 1 (absorbent article)" include various physical properties of the diaper 1 such as the total longitudinal length, and the name of the size group to which the diaper 1 (the packaging structure 15) inside the packaging container 16 belongs. Regarding the latter, for example, when the series has the first to fifth size groups described above, and the packaging structure 15 corresponds to the first size group, the name of the first size (for example, NB size) can be displayed on the outer surface of the packaging container 16 constituting the packaging structure 15.

[0041] Instead of displaying the physical properties of the diaper 1 such as the overall vertical length on the outer surface of the packaging container 16, it is useful to display the name of the above size group and the weight of the person (assumed weight) that the diaper 1 in the packaging container 16 assumes as the wearer. This is because, rather than displaying the physical properties of the absorbent article such as the overall vertical length and allowing the purchaser of the absorbent article (for example, the parent of an infant who is the wearer of the absorbent article) to select an absorbent article that fits the size of the wearer based on these physical properties, it is easier to select an absorbent article that fits the size of the wearer by displaying the weight of the wearer that correlates with these physical properties and allowing the selection to be made based on this weight. This is because in many cases, a more suitable size of absorbent article can be selected.

[0042] The series of the present invention is characterized in that all of the following relationships A to C are satisfied among a plurality of size groups included therein. The inventors of the present invention focused particularly on the changes in the behavior patterns during the growth stages of infants, and among the numerous influencing factors examined, found that the following relationships A to C greatly affect the fitness for each behavior pattern. In particular, with physical growth, it was found that satisfying the following relationships A to C, rather than simply increasing the dimensions of the overall vertical length, the dorsal panel, and the ventral panel, has a great impact on fitness. Furthermore, it was found that satisfying the following relationships A to C not only improves fitness in this way and makes it less likely for excrement to leak from the dorsal part, but also simultaneously obtains the effects of the ventral panel such as facilitating the wearing operation and preventing skin troubles of the wearer caused by contact with the fastening member. In the following relationships A to C, the diaper 1 described above is taken as an example of the absorbent article included in each size group. 1) Relationship A: Regarding the overall vertical length of the diaper 1, the overall vertical length of the size group with a relatively small size < the overall vertical length of the size group with a relatively large size 2) Relationship B: Regarding the ratio of the fixed length L7 (see FIG. 1) of the dorsal panel 7 to the overall vertical length of the diaper 1 (hereinafter also referred to as the "dorsal panel / overall vertical length ratio"), Ratio of the length of the back panel to the total longitudinal length of the relatively small-sized group of sizes < ratio of the length of the back panel to the total longitudinal length of the relatively large-sized group of sizes (hereinafter also referred to as "relationship B1"), or Ratio of the length of the back panel to the total longitudinal length of the relatively small-sized group of sizes = ratio of the length of the back panel to the total longitudinal length of the relatively large-sized group of sizes (hereinafter also referred to as "relationship B2") 3) Relationship C: Regarding the ratio of the fixed length L14 (see FIG. 1) of the ventral panel 14 to the total longitudinal length of the diaper 1 (hereinafter also referred to as "ratio of the ventral panel to the total longitudinal length"), ratio of the ventral panel to the total longitudinal length of the relatively small-sized group of sizes > ratio of the ventral panel to the total longitudinal length of the relatively large-sized group of sizes

[0043] The fact that the relationship A holds is synonymous with the fact that as the size of the absorbent article increases, that is, as the physical property of the absorbent article serving as an index of the size (for example, the total longitudinal length) increases, the total longitudinal length of the absorbent article increases. Therefore, when the total longitudinal length of the absorbent article is adopted as the physical property, relationship A naturally holds among a plurality of size groups included in the series. The total longitudinal length of the absorbent article such as the diaper 1 defined by relationship A corresponds to the length from the ventral side (front side) of the wearer of the absorbent article, through the crotch part, to the dorsal side (rear side) (hereinafter also referred to as "wearer front-back length"). Therefore, a series of absorbent articles in which relationship A holds can correspond to body shapes of a plurality of types of wearers having different wearer front-back lengths, and can provide an absorbent article suitable for the growth stage of an infant's body.

[0044] The fact that the relationship B holds is synonymous with the fact that as the size of the absorbent article (for example, the total longitudinal length) increases, the ratio of the back panel to the total longitudinal length increases (relationship B1 holds), or the ratio of the back panel to the total longitudinal length is constant (relationship B2 holds). Generally, in the physical growth stage of an infant, the buttocks grow to be equal to or greater than the wearer front-back length. Therefore, in order for a series of absorbent articles to be able to correspond to various body shapes of wearers including infants, it is necessary to provide a certain width to the size of the part (dorsal part) corresponding to the wearer's buttocks as a whole for a plurality of absorbent articles or size groups included in the series. The relationship B is adopted in the present invention from such a perspective. Taking the diaper 1 described above as an example, focusing on the fixed length L7 (see FIG. 1) of the dorsal panel 7 disposed on the dorsal part C, when the size of the diaper 1 is increased (for example, the overall length in the vertical direction is increased), by increasing the fixed length L7 (establishing the relationship B1) or keeping the fixed length L7 constant (establishing the relationship B2), a series of absorbent articles corresponding to the enlargement of the buttocks accompanying the physical growth of the wearer can be obtained. From the perspective of making the operational effects according to the relationship B more certain, it is preferable that the relationship B1 is established rather than the relationship B2.

[0045] The establishment of the relationship C is synonymous with the ventral panel / overall length ratio becoming smaller as the size (for example, the overall length in the vertical direction) of the absorbent article increases. Generally, as the physical growth of the wearer progresses, the physical activities peculiar to the wearer become more active. In particular, when the wearer is an infant, at a low age, the posture with the feet open horizontally (the M-shaped posture with both knees and hip joints bent sufficiently) is often taken, while at a high age, the posture with the feet closed is taken, and the movement of putting the feet forward (ventral side) becomes more frequent. Also, not only the movement on the ventral side (front side) of the feet needs to be considered, but also the ease of wearing the absorbent article needs to be taken into account. In order to provide a series of absorbent articles that can cope with the increased activity of the feet accompanying physical growth and are easy to wear, it is necessary to give a certain width to the size of the part corresponding to the ventral side (ventral part) of the wearer as a whole for a plurality of absorbent articles or size groups included in the series. The relationship C is adopted in the present invention from such a perspective. Taking the diaper 1 described above as an example, focusing on the fixed length L14 (see FIG. 1) of the ventral panel 14 disposed on the ventral part A, when the size of the diaper 1 is increased (for example, the overall length in the vertical direction is increased), by shortening the fixed length L14 (establishing the relationship C), the inconvenience of the movement of the feet being hindered by the ventral panel 14 is prevented, and a series of absorbent articles corresponding to the increased activity of the feet accompanying the physical growth of the wearer can be obtained.

[0046] Since the relationships A to C are satisfied in the series of the present invention, it is possible to provide an absorbent article suitable for the physical growth of the wearer of the absorbent article and corresponding to the growth stage of the wearer. The "suitable absorbent article" mentioned here specifically refers to, for example, an absorbent article that has excellent fitness to the wearer's buttocks by a fastening member including a back panel, is less likely to cause leakage of excrement from the back side, and enjoys the effects of the front panel (facilitation of wearing operation, prevention of skin trouble of the wearer caused by contact with the fastening member, etc.), and at the same time, the inconvenience that the movement of the wearer's feet is hindered by the front panel is prevented. The series of the present invention is particularly suitable as a series of absorbent articles for infants. As an example of the usage mode of the series of the present invention, when the infant who is the wearer is at a low month age, an absorbent article belonging to a size group with a relatively small size (for example, the total longitudinal length of the absorbent article) is used, and as the infant grows older, it is switched to a size group with a relatively large size.

[0047] In particular, like the back panel 7 in the diaper 1, when the back panel has elasticity in the lateral direction, the followability of the back panel to the movement of the wearer of the absorbent article is improved, and even when the wearer takes a posture such as bending forward during wearing of the absorbent article, the back side can follow closely to the wearer's body, which is preferable.

[0048] In addition, in particular, like the back panel 7 in the diaper 1, when the back panel has a rectangular shape in plan view, for example, compared with the case where the plan view shape of the back panel is a tapered shape in which the longitudinal length (the length in the direction orthogonal to the extending direction from the side edge of the absorbent main body of the back panel, the length of the longitudinal direction X of the above-mentioned diaper 1) gradually decreases outward in the lateral direction, it becomes easier to cover the front side with the back panel during wearing of the absorbent article, and thereby the fitness of the entire absorbent article can be further improved, which is preferable.

[0049] From the viewpoint of making the effects of the relationship B more certain, the ratio of the relationship B (the ratio of the dorsal panel to the total longitudinal length) is preferably 0.10 or more, more preferably 0.13 or more, and still more preferably 0.16 or more. On the other hand, the upper limit of the ratio of the dorsal panel to the total longitudinal length is not particularly limited. However, if such a ratio becomes too large, the diaper may interfere with the wearer's feet during wearing, making it difficult to wear, and there may be inconveniences such as the movement of the infant's legs being particularly hindered in the worn state. Considering this point, it is preferably 0.30 or less, more preferably 0.27 or less, and still more preferably 0.24 or less. From the same viewpoint, the ratio of the relationship C (the ratio of the ventral panel to the total longitudinal length) is preferably less than 0.20, more preferably 0.18 or less, and still more preferably 0.16 or less. On the other hand, the lower limit of the ratio of the ventral panel to the total longitudinal length is not particularly limited. However, from the viewpoint of ensuring the effects of the ventral panel, particularly from the viewpoint of reliably preventing in advance the inconveniences caused by the contact between the fastening part by the ventral panel and the skin of the wearer, it is preferably 0.05 or more, more preferably 0.07 or more, and still more preferably 0.10 or more.

[0050] The dimensions of each part of the absorbent article included in the series of the present invention are not particularly limited. However, from the viewpoint of making the above-described effects more certain, it is preferable to set them as follows. The total longitudinal length of the absorbent article is preferably 250 mm or more, more preferably 350 mm or more, and preferably 700 mm or less, more preferably 600 mm or less. When the total longitudinal length of the absorbent article is divided into five size groups as an embodiment of the series of the present invention, each size group is preferably set as follows. The total longitudinal length of the absorbent article of the first size (e.g., NB size) is preferably 350 mm or more, more preferably 360 mm or more, and preferably 390 mm or less, more preferably 380 mm or less. The total longitudinal length of the absorbent article of the second size (e.g., S size) is preferably 390 mm or more, more preferably 400 mm or more, and preferably 430 mm or less, more preferably 420 mm or less. The total longitudinal length of the absorbent article of the third size (e.g., M size) is preferably 420 mm or more, more preferably 430 mm or more, and preferably 460 mm or less, more preferably 450 mm or less. The total longitudinal length of the absorbent article of the fourth size (e.g., L size) is preferably 455 mm or more, more preferably 465 mm or more, and preferably 485 mm or less, more preferably 495 mm or less. The total longitudinal length of the absorbent article of the fifth size (e.g., XL size) is preferably 480 mm or more, more preferably 490 mm or more, and preferably 530 mm or less, more preferably 520 mm or less. The fixed length L7 of the dorsal panel (see FIG. 1) is preferably 60 mm or more, more preferably 70 mm or more, and preferably 120 mm or less, more preferably 110 mm or less. The fixed length L14 of the ventral panel (see FIG. 1) is preferably 40 mm or more, more preferably 50 mm or more, and preferably 80 mm or less, more preferably 70 mm or less.

[0051] As described above, the present invention has been described based on its preferred embodiments. However, the present invention is not limited to the above embodiments and can be appropriately modified without departing from the spirit of the present invention. Regarding the embodiments of the present invention described above, the following additional remarks are disclosed.

[0052] <1> An absorbent article series including a plurality of absorbent articles of different sizes, the plurality of absorbent articles being divided into a plurality of size groups corresponding to the number of types of their sizes, each of the plurality of absorbent articles has a longitudinal direction extending from the ventral side of the wearer through the crotch portion to the dorsal side and a transverse direction orthogonal thereto, and has, in the longitudinal direction, a lower crotch portion disposed at the crotch portion during wearing, a ventral portion disposed on the ventral side of the wearer relative to the lower crotch portion, and a dorsal portion disposed on the dorsal side of the wearer relative to the lower crotch portion, and An absorbent main body including an absorber, a pair of fastening members fixed to both side edges along the longitudinal direction of the absorbent main body at the dorsal side portion, and a pair of ventral panels fixed to both side edges along the longitudinal direction of the absorbent main body at the ventral side portion, wherein the fastening members are fastened to the outer surface of the absorbent main body and adapted to be worn by a wearer. The absorber includes a laminated structure of two or more absorbent cores. Each of the pair of fastening members includes a dorsal panel fixed to the absorbent main body so as to extend outward in the lateral direction from a side edge along the longitudinal direction of the absorbent main body, and the dorsal panel has a longer fixed length in the longitudinal direction with respect to the absorbent main body than the ventral panel. A series of absorbent articles in which all of the following relationships A to C are satisfied among the plurality of size groups. Relationship A: With respect to the total length in the longitudinal direction of the absorbent article, a size group with a relatively small size < a size group with a relatively large size Relationship B: With respect to the ratio of the fixed length (L7) in the longitudinal direction of the dorsal panel to the total length in the longitudinal direction of the absorbent article, a size group with a relatively small size < a size group with a relatively large size, or a size group with a relatively small size = a size group with a relatively large size Relationship C: With respect to the ratio of the fixed length (L14) in the longitudinal direction of the ventral panel to the total length in the longitudinal direction of the absorbent article, a size group with a relatively small size > a size group with a relatively large size <2> The series of absorbent articles according to <1>, wherein the ratio of Relationship B is 0.10 or more, preferably 0.13 or more, more preferably 0.16 or more. <3> The series of absorbent articles according to <1> or <2>, wherein the ratio of Relationship C is 0.05 or more, preferably 0.07 or more, more preferably 0.10 or more. <4> The series of absorbent articles according to any one of <1> to <3>, wherein the ratio of Relationship C is less than 0.20, preferably 0.18 or less, more preferably 0.16 or less. <5> The series of absorbent articles according to any one of <1> to <4>, wherein the ratio of the relationship B is 0.30 or less, preferably 0.27 or less, more preferably 0.24 or less.

[0053] <6> The series of absorbent articles according to any one of <1> to <5>, wherein the back panel has stretchability in the lateral direction. <7> The series of absorbent articles according to <6>, wherein the back panel includes a panel material forming the main body of the back panel and an elastic member fixed to the panel material and having stretchability in the lateral direction. <8> The series of absorbent articles according to <6> or <7>, wherein the back panel includes two opposing panel materials, and a plurality of the elastic members extending in the lateral direction are intermittently arranged in the longitudinal direction between the two panel materials. <9> The series of absorbent articles according to any one of <1> to <8>, wherein the back panel has a quadrangular shape in plan view. <10> The series of absorbent articles according to <9>, wherein the back panel has a rectangular shape in plan view. <11> The series of absorbent articles according to any one of <1> to <10>, wherein the fastening member further includes a fastening tape fixed to the back panel so as to extend outward in the lateral direction from an outer edge along the longitudinal direction of the back panel in addition to the back panel. <12> The series of absorbent articles according to <11>, wherein the fastening tape includes a tape base material having a rectangular shape in plan view and a fastening portion fixed to the tape base material. <13> The series of absorbent articles according to <12>, wherein the fastening portion is fixed to a skin-facing surface of an extending portion from the outer edge of the back panel in the tape base material.

[0054] <14> The longitudinal fixed length (L7) of the dorsal panel is preferably 60 mm or more, more preferably 70 mm or more, and preferably 120 mm or less, more preferably 110 mm or less, for the series of absorbent articles according to any one of <1> to <13> above. <15> The longitudinal fixed length (L14) of the ventral panel is preferably 40 mm or more, more preferably 50 mm or more, and preferably 80 mm or less, more preferably 70 mm or less, for the series of absorbent articles according to any one of <1> to <14> above. <16> The laminated structure includes a laminated-type absorbent core mainly composed of an aggregate of fiber materials and a sheet-type absorbent core in which water-absorbing polymer particles are fixed inside or on the surface of a fiber sheet, for the series of absorbent articles according to any one of <1> to <15> above. <17> The number of the size groups is 3 or more, for the series of absorbent articles according to any one of <1> to <16> above. <18> The absorbent article is for infants (children from zero days old to less than 1 year old), for the series of absorbent articles according to any one of <1> to <17> above. <19> Each of the plurality of size groups includes a plurality of the absorbent articles and a packaging container that houses the plurality of absorbent articles therein, for the series of absorbent articles according to any one of <1> to <18> above. <20> On the outer surface of the packaging container, a common name for the plurality of absorbent articles included in the series and / or information regarding the absorbent articles is displayed, and the information includes the name of the size group to which the absorbent articles in the packaging container belong, for the series of absorbent articles according to <19> above. <21> The plurality of size groups have a common brand name, for the series of absorbent articles according to any one of <1> to <20> above. <22> The series of absorbent articles according to <21>, in which all of the relationships A to C are satisfied among all size groups having the common brand name.

Explanation of Signs

[0055] 1 Disposable diaper (absorbent article) A Abdominal side B Inguinal region C Dorsal side 2 Absorbent main body 5 Absorbent body 51 First core 52 Second core 6 Fixing member 7 Dorsal panel 8 Fastening tape 14 Abdominal panel 15 Packaging structure 16 Packaging container X Longitudinal direction Y Lateral direction

Claims

1. A series of absorbent articles including a plurality of absorbent articles of different sizes, wherein the plurality of absorbent articles are divided into a plurality of size groups corresponding to the number of types of their sizes, Each of the plurality of absorbent articles has a longitudinal direction extending from the ventral side of the wearer through the crotch portion to the dorsal side and a transverse direction orthogonal thereto, and has, in the longitudinal direction, a lower crotch portion disposed in the crotch portion during wearing, a ventral portion disposed on the ventral side of the wearer relative to the lower crotch portion, and a dorsal portion disposed on the dorsal side of the wearer relative to the lower crotch portion, and An absorbent main body including an absorber, a pair of fastening members fixed to both side edges along the longitudinal direction of the absorbent main body in the dorsal portion, and a pair of ventral panels fixed to both side edges along the longitudinal direction of the absorbent main body in the ventral portion, and the fastening members are fastened to the outer surface of the absorbent main body so as to be worn by the wearer, The absorber includes a laminated structure of two or more absorbent cores, Each of the pair of fastening members includes a dorsal panel fixed to the absorbent main body so as to extend outward in the transverse direction from a side edge along the longitudinal direction of the absorbent main body, and the dorsal panel has a longer fixed length in the longitudinal direction with respect to the absorbent main body than the ventral panel, A series of absorbent articles in which all of the following relationships A to C are satisfied among the plurality of size groups. Relationship A: For the total length in the longitudinal direction of the absorbent article, a size group with a relatively small size < a size group with a relatively large size Relationship B: For the ratio of the fixed length in the longitudinal direction of the dorsal panel to the total length in the longitudinal direction of the absorbent article, a size group with a relatively small size < a size group with a relatively large size, or a size group with a relatively small size = a size group with a relatively large size Relationship C: For the ratio of the fixed length in the longitudinal direction of the ventral panel to the total length in the longitudinal direction of the absorbent article, a size group with a relatively small size > a size group with a relatively large size

2. The series of absorbent articles according to claim 1, wherein the ratio of the relationship B is 0.10 or more and the ratio of the relationship C is less than 0.

20.

3. The series of absorbent articles according to claim 1 or 2, wherein the ratio of the relationship B is 0.30 or less.

4. The series of absorbent articles according to any one of claims 1 to 3, wherein the back panel has elasticity in the lateral direction.

5. The series of absorbent articles according to any one of claims 1 to 4, wherein the back panel has a rectangular shape in plan view.

6. The series of absorbent articles according to any one of claims 1 to 5, wherein the number of the size groups is 3 or more.

7. The series of absorbent articles according to any one of claims 1 to 6, wherein each of the plurality of size groups includes a plurality of the absorbent articles and a packaging container for accommodating the plurality of absorbent articles therein.

8. The series of absorbent articles according to any one of claims 1 to 7, wherein the plurality of size groups have a common brand name.

9. The series of absorbent articles according to claim 8, wherein all of the relationships A to C are satisfied among all the size groups having the common brand name.

Images